RHEL8/UEFI: Cannot boot RHEL 8.9 kernels, getting "grub-core/loader/i386/efi/linux.c:385:(hd0,gpt2)/vmlinuz-4.18.0-513.xxx.el8_9.x86_64 has invalid signature"

Solution Verified - Updated -

Issue

  • After a system update, a new kernel from RHEL 8.9 release has been installed (kernel-4.18.0-513 serie), but cannot be booted, the following error being seen on the console:

    error: ../../grub-core/loader/i386/efi/linux.c:385:(hd0,gpt2)/vmlinuz-4.18.0-513.5.1.el8_9.x86_64 has invalid signature.
error: ../../grub-core/loader/i386/efi/linux.c:256:you need to load the kernel first.

Press any key to continue...

Environment

  • Red Hat Enterprise Linux 8
    • kernel-4.18.0-513.xxx
    • UEFI

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